From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. (Metaph.) The doctrine that no fact or principle can be certainly known; the tenet that all knowledge is uncertain; Pyrrohonism; universal doubt; the position that no fact or truth, however worthy of confidence, can be established on philosophical grounds; critical investigation or inquiry, as opposed to the positive assumption or assertion of certain principles.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
46 Moby Thesaurus words for "skepticism": Humism, Pyrrhonism, agnosticism, apprehension, caution, cautiousness, concern, diffidence, disinclination to believe, distrust, distrustfulness, doubt, doubtfulness, dubiety, dubiousness, guardedness, half-belief, incertitude, inconvincibility, incredulity, leeriness, misdoubt, misgiving, mistrust, mistrustfulness, qualm, qualmishness, question, resistiveness to belief, scoffing, scruple, scrupulousness, self-doubt, shadow of doubt, skepticalness, suspicion, suspiciousness, total skepticism, tough-mindedness, uncertainty, unconvincibility, uncredulousness, unpersuadability, unpersuasibility, wariness, wonder
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